Police have seized more than $1 billion worth of ice, found in a shipment of stick-on gel bras and inside storage units filled with art supplies.
Authorities have called it the largest seizure of liquid methamphetamine in Australia's history.
Four people have been charged over the importation and manufacturing of 720 litres of methylamphetamine.
The drugs were discovered by authorities in a shipment from Asia to Australia.
The remainder was found in storage units in Sydney.
It’s alleged the ice was hidden in stick-on ‘water magic’ push up bras, bottles of craft glue and painting sets.
Photo: The drugs were allegedly found in stick on bra packets. Twitter
Federal Justice Minister Michael Keenan has said it was the largest seizure of liquid methamphetamine in Australia's history.
"This is also one of the largest drug seizures in our country," he said.
"This has resulted in 3.6 million individual hits of ice being taken off our streets with a street value of $1.26 billion.
The Joint Organised Crime Group operation involved the Australian Federal Police, NSW Police, Australian Border Force and Australian Crime Commission.
Officials said the operation began in December last year when the Australian Border Force examined a shipping container out of Hong Kong.
“That shipping container was found to contain gel bra inserts and hidden inside those gel bra inserts was 190 litres of liquid methamphetamine,” said Commander Chris Sheehan.
An additional 530 litres of liquid methamphetamine were found during the investigation by joint organised crime investigators.
“These drugs were concealed inside art supplies housed in five storage units in Sydney in the suburbs of Miranda, Hurstville, Padstow and Kingsgrove,” Mr Sheehan said.
A 33-year-old Hong Kong national was charged over the original seizure.
Following his arrest, another three Hong Kong nationals - a 59-year-old man, a 37-year-old man, and a 52-year-old woman - were arrested and charged over the drugs located in the storage facilities.
“This has been a very good day for Australia law enforcement and a very bad day for the organised criminals that have targeting the Australian drug market,” Mr Keenan said.